wine ptrace trouble

[Peter Beutner]

Marcus Meissner schrieb:
> On Sun, Oct 23, 2005 at 08:33:40PM +0200, Peter Beutner wrote:
> 
>>Hi
>>I've been trying to get an older game(Heart Of Darkness) to work with wine.
>>Appearently the game uses some kind of copy-protection(securom i suppose) which let wine
>>abort with the following error: "Trace/breakpoint trap".
>>After some debugging sessions I managed to reproduce the problem.
>>See the attached program(debug.c, simply compile with mingw).
>>
>>The problem is the following(as far as I understand it):
>>- app sets up an exception handler
>>- enables single-step debugging -> exception handler get invoked
>>- in the exception handler:- re-enables single-step debugging
>>                           - modifies some debug register in the CONTEXT struct
>>  -> because of that set_thread_context ist called and wineserver PTRACE_ATTACH to the 	
>>     process, modifies these registers, then resumes the process
>>- as wineserver doesn't detach from the process it will get the next SIGTRAP signal and
>>  appearently it seems to ignore that signal
>>- [as nobody cares about the SIGTRAP signal the process get killed]
>>I'm not completly sure about the last step and the fact what wineserver really does with
>>the SIGTRAP signal.
> 
> 
> Do you use a AMD64 machine? At least mine has some troubles
> with ptrace on kernel 2.6.13 :/

yes, it is an amd64 with 64bit kernel and wine running in a 32bit chroot.

> 
> Ciao, Marcus
> 
> 
>